Coolhaas, Willem a Dutch theologian of the family of Gaspard, was born at Deventer, November 11, 1709. He completed his studies at Utredit, where he received the degree of doctor, after having sustained a thesis upon the sentiment of the mottos πἰστις, πιστός, and πιστεύειν. He was appointed minister to Langerak; then, in 1753, professor of languages and Oriental antiquities at Amsterdam, but in 1755 was called to the pastoral functions of the same city. Here he died, in 1772, leaving, Analogia Temporum et Modorum Hebrcece Linguce: — Observationes Philologico- Exegeticae in Quinque Mosis Libros: — De Interrogationibus in Sacro Codice Hebraeo, and two volumes of Sermons in Dutch. See Hoefer, Nouv. Biog. Generale, s.v.; Biog. Universelle, s.v.